paul ryan to build on mitt romney's momentum. senior white house correspondent bill plante has more on that. bill, good evening. >> good evening, jeff, you know, the vice presidential debate is normally a kind of sideshow but this year it has the potential to be a major event. not only because the president didn't do very well in his debate last week, but also because of the contrast between the two candidates. >> it's biden versus ryan. >> oh, yeah, i better get ready for that. >> age -- >> this is deadly earnest. >> veruous youth. a great society liberal. >> yes, we're going to ask the wealthy to pay more. >> reporter: versus the tea party conservative. >> at a time when we have a jobs crisis in america, wouldn't it be nice to have a job creator in the white house? >> reporter: biden became a u.s. senator when ryan turned three. and ran for president twice. he's been on many debate stages before. >> there's nothing like standing up before 20, 30, 40, 50, 70 million people. >> reporter: but bidesen also a nonstop talker prone to